Cylinder 3 Above Knock Threshold

What this code means

The engine controller detected excessive knock (detonation) in cylinder 3 that exceeded the allowable threshold. This can be caused by ignition timing, fuel quality, or carbon buildup issues.

Symptoms

• Engine pinging or knocking noise
• Reduced power
• Check engine light on

Common causes

• Low octane or poor quality fuel
• Carbon buildup in combustion chamber
• Faulty knock sensor
• Overheating engine

Diagnostic steps

1. Check for stored trouble codes and freeze frame data
2. Verify fuel quality and octane rating
3. Inspect knock sensor and wiring
4. Check for carbon deposits and cooling system operation

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